<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <!-- <img v-bind:src="pic" alt=""> -->
        <button @click="pic = './images/girl.png'">变身</button>
        <hr>
        <!-- 简写形式 -->
        <img :src="pic" alt="">
    </div>
    <script src="./vue.js"></script>
    <script>
        new Vue({
            el: "#app",
            data() {
                return {
                    pic: './images/boy.png'
                }
            }
        })
    </script>
</body>

</html>